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avancna — Chengjiang Deuterostomes BW

Published: 2008-09-30 06:21:33 +0000 UTC; Views: 2277; Favourites: 16; Downloads: 0
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Description Various deuterostomes from the Early Cambrian of Chengjiang.

From top is Haikouella lanceolata, Haikouichthys ercaicunensis, Myllokunmingia fengjiao, Yunnanozoon lividum. In back is Vetucola cuneata
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Comments: 6

Giant-Blue-Anteater [2008-10-02 01:06:47 +0000 UTC]

Did Haikouicthys have ventral fins? If so, did they have paired ventral fins or a singular one?

👍: 0 ⏩: 1

avancna In reply to Giant-Blue-Anteater [2008-10-02 01:11:20 +0000 UTC]

I don't think so, though, what I've read suggests that Myllokunmingia did have paired ventral fins.

👍: 0 ⏩: 1

Giant-Blue-Anteater In reply to avancna [2008-10-02 01:14:18 +0000 UTC]

So it wasn't our ancestor after all?

👍: 0 ⏩: 1

avancna In reply to Giant-Blue-Anteater [2008-10-02 01:24:39 +0000 UTC]

It probably is, or very close to our ancestor.

👍: 0 ⏩: 1

Giant-Blue-Anteater In reply to avancna [2008-10-02 22:11:07 +0000 UTC]

I made that assumption since I think paired ventral fins would give rise to more complex ones like the pectoral and pelvic fins.

👍: 0 ⏩: 1

avancna In reply to Giant-Blue-Anteater [2008-10-03 01:58:42 +0000 UTC]

On the other hand, the oldest known true vertebrates, i.e., Arandaspis, Sacabambaspis, Astraspis, did not any fins, save for the tail fins. So, it could be that the paired ventral fins of Myllokunmingia were lost, and not re-evolved until the Silurian with the first osteostracans, or that Myllokunmingia split off from the chordates and developed its own side-fins.

👍: 0 ⏩: 0